Publication Type

Journal Article

Version

publishedVersion

Publication Date

6-2016

Abstract

This paper explores in several prototypical models a convenient inference procedure for nonstationary variable regression that enables robust chi-square testing for a wide class of persistent and endogenous regressors. The approach uses the mechanism of self-generated instruments called IVX instrumentation developed by Magdalinos and Phillips (2009b). We first show that these methods remain valid for regressors with local unit roots in the explosive direction and mildly explosive roots, where the roots are further from unity in the explosive direction than 0 (n(-1)). It is also shown that Wald testing procedures remain robust for multivariate regressors with certain forms of mixed degrees of persistence. These robustifications are useful in econometric inference, for example, when there are periods of mildly explosive trends in some or all of time series employed in the analysis but the exact knowledge on the regressor persistence is unavailable. Some aspects of the choice of the IVX instruments are investigated and practical guidance is provided but the issue of optimal IVX instrument choice remains unresolved. The methods are straightforward to apply in practical work such as predictive regression applications in finance. (C) 2016 Elsevier B.V. All rights reserved.

Keywords

Chi-square, Instrumentation, IVX methods, Local to unity, Mild integration, Mild explosiveness, Predictive regression, Robustness

Discipline

Econometrics | Economics

Research Areas

Econometrics

Publication

Journal of Econometrics

Volume

192

Issue

2

First Page

433

Last Page

450

ISSN

0304-4076

Identifier

10.1016/j.jeconom.2016.02.009

Publisher

Elsevier

Additional URL

https://doi.org/10.1016/j.jeconom.2016.02.009

Download

Included in

Econometrics Commons

Share

COinS